Analisis Teknis Jalur Pipa Cryogenic Dengan Metode Full Flange Rating Dan Non-Full Flange Rating

Abstract

This study compares the technical evaluation of cryogenic pipeline systems using the Full Flange Rating and Non-Full Flange Rating methods. Cryogenic pipelines in a bio-refinery project operate at -196°C with Liquid Nitrogen service, using ASTM A312 TP 316L material. Full Flange Rating refers to the use of maximum allowable flange pressure per ASME B16.5, while Non-Full Flange Rating uses actual operating pressure. Results show that the Non-Full Flange Rating method allows for a 20–30% reduction in wall thickness, providing material and cost savings while maintaining safety. This paper provides an engineering basis for choosing between the two methods in cryogenic piping design.